LVM and mirroring

[Chris Fadrowski]

Here is the question,

I have 2 disks in my server. One disk has Oracle Binaries (10 gig) and (8 gig) of secondary swap. (18 gb drive). I want to mirror my Oracle Binaries to the 2nd disk. How can i go about mirroring my 10 gig LVOL to the other disk. Or do i have to mirror the whole disk instead of the LVOL. Basically i just want to mirror /dev/vg01/lvol21 to another device. I am concerned however that the size of the mirror has to be the same. Can some one layout the procedure for me?

[Pete Randall]

Chris,

MirrorDisk/UX functions at the Lvol level, so you can mirror either, both, or none.

Pete

[Ken Hubnik_2]

Mirroring has nothing to do with the physical disk. It is done on the lvol level.

lvextend -m 1 /dev/vg01/lvol21

[Sean OB_1]

Mirrordisk mirrors at the volume level so you can simply mirror the oracle volume to the other disk.

lvextend -m 1 /dev/vgnn/lvoltomirror /dev/dsk/cNtNdN

[Rajasekhar Raman]

All suggestions made above are absolutely correct. The only other precautionary statement I would make is that make sure the disks are identical in performance, other wise you will be operation at the speed of the slower disk, also if they have the same capacity it helps in case you need to expand the logical volume in the future.